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To: stealth-3000gt-digest@list.sirius.com
Subject:
Team3S Digest V1 #47
Reply-To: stealth-3000gt
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Team3S Digest Saturday,
December 12 1998 Volume 01 : Number
047
----------------------------------------------------------------------
Date:
Fri, 11 Dec 1998 18:00:06 -0500
From: "Bob Fontana" <bfontana@securitytechnologies.com>
Subject:
RE: Team3S: EGR Trivia
Hey Dave,
Sounds good. I'm all but
convinced that you have a good point. Under
boost, however, the EGR has
none of these positive effects since the valve
is closed. It it were
open during boost, manifold pressure would exceed the
02 housing and our
charge air would end up leaking out throught the EGR
valve. Detonation
while *not* under boost has never been a problem in these
cars, so I'm left
wondering just what its purpose is other than preheating
the charge air
during initial cold weather startup and perhaps a little
exhaust cleanup
during cruising. What else would it be?
- -Bob
>
>
Bottom line: I don't see how perfomance can be improved by removing
> this
system. If anything I think it makes performance worse. Tell
> me why I'm
wrong guys. Please.
>
For subscribe/unsubscribe info, our web page
is http://www.bobforrest.com/Team3S.htm
------------------------------
Date:
Fri, 11 Dec 1998 15:55:28 -0800
From: "Dave Allison" <dallison@siebel.com>
Subject: RE:
Team3S: EGR Trivia
Good point regarding EGR activation at
boost...
But, if the EGR valve is blocked during boost situations, what
is
the point of removing the device at the expense of engine cruising
quality
and gas mileage?
With your post I'm even MORE confused why
someone would want to
tamper with a subsystem that is irrelevant during WOT
situations.
- --------------------------------------
Dave
Allison
Network Engineer
Siebel Systems, Inc.
1875 South Grant
San
Mateo, CA 94402
650-295-5410
dallison@siebel.com
-
-----Original Message-----
From: Bob Fontana [mailto:bfontana@securitytechnologies.com]
Sent:
Friday, December 11, 1998 3:00 PM
To: stealth-3000gt@list.sirius.com
Subject:
RE: Team3S: EGR Trivia
Hey Dave,
Sounds good. I'm all
but convinced that you have a good point. Under
boost, however, the EGR
has none of these positive effects since the valve
is closed. It it
were open during boost, manifold pressure would exceed the
02 housing and our
charge air would end up leaking out throught the EGR
valve. Detonation
while *not* under boost has never been a problem in these
cars, so I'm left
wondering just what its purpose is other than preheating
the charge air
during initial cold weather startup and perhaps a little
exhaust cleanup
during cruising. What else would it be?
- -Bob
>
>
Bottom line: I don't see how perfomance can be improved by removing
> this
system. If anything I think it makes performance worse. Tell
> me why I'm
wrong guys. Please.
>
For subscribe/unsubscribe info, our web page
is
http://www.bobforrest.com/Team3S.htm
For
subscribe/unsubscribe info, our web page is http://www.bobforrest.com/Team3S.htm
------------------------------
Date:
Fri, 11 Dec 1998 19:10:24 -0500
From: "Bob Fontana" <bfontana@securitytechnologies.com>
Subject:
RE: Team3S: EGR Trivia
Dave,
The reason I think it's relevant is
because of the copper flex pipe that
connects the 02 housing to the plenum
opens up to a passageway that runs
along the back wall of the plenum on the
inside. When the valve is closed,
this passageway is filled with
1000F-1300F exhaust gas. When it is open,
exhaust gets released into
the plenum. Even if it never opens, the heat
from the exhaust gas will
warm up the plenum. In fact, it gets DAMN hot!
To a drag racer,
anything that heats up charge air handlers is not a good
thing.
Granted, in cruising situations, the EGR is probably of some
benefit.
But in 10, 11 or 12-second bursts, a functioning EGR valve is of
no
importance.
I think. Anyone?
- -Bob
> Good point
regarding EGR activation at boost...
>
> But, if the EGR valve is
blocked during boost situations, what is
> the point of removing the
device at the expense of engine cruising
> quality and gas
mileage?
>
> With your post I'm even MORE confused why someone would
want to
> tamper with a subsystem that is irrelevant during WOT
situations.
>
For subscribe/unsubscribe info, our web page is http://www.bobforrest.com/Team3S.htm
------------------------------
Date:
Sat, 12 Dec 1998 07:11:24 -0600
From: xwing <xwing@execpc.com>
Subject: Re: Team3S:
EGR Trivia
EGR open under cruise allows unburnable waste gasses in,
dilutes the
incoming air with no-oxygen air. To compensate, you have to
open the
throttle plate more to let adequate oxygenated air in to do
the
combustion. With throttle open more, there is less pumping loss,
less
VACUUM created, so engine is running same HP with
MORE-OPEN
throttleplate. Creating the intake vacuum wastes a fair
amount of
energy, costs MPG. That is part of the reason Diesel engines
are
efficient (especially with a turbo)--they have NO throttleplate, have
NO
intake vacuum--are at full atmospheric pressure in intake tract at
all
times, no losses to vacuum production/throttling. This is part of
it at
least; there is decrease in NOx production too, as I recall.
Jack
Tertadian
Wishing the Global Warming Farce was real...
Bob Fontana
wrote:
> Under boost EGR has none of these positive effects since
valve
> is closed. If open during boost, manifold pressure would
exceed
> 02 housing; charge air would leak out through EGR
>
valve. Detonation while *not* under boost isn't problem
> so I'm
wondering what purpose is other than preheating
> charge air during cold
startup and
> exhaust cleanup during cruising.
>
-Bob
> > Bottom line: I don't see how perfomance can be improved by
removing
> > this system. If anything I think it makes performance
worse. Tell
> > me why I'm wrong guys. Please.
For
subscribe/unsubscribe info, our web page is http://www.bobforrest.com/Team3S.htm
------------------------------
Date:
Sat, 12 Dec 1998 21:25:07 EST
From: LotoBoost@aol.com
Subject: Team3S:
Corrections for Turbo Mag's EIP Shootout!
All,
Just got a chance to get the new Turbo Magazine (January 1999) which
featured
the EIP Tuning and Toyo Tires East Coast Import Shootout.
After reading,
I think they mistakenly though I had Adam Weltz's car when they
referenced
it, and this is what the "Winners Circle" should have read:
HH - Diamond
Star RWD/AWD
Winner.......Randall Mahaffey '94 Stealth Twin
Turbo 11.917 117.62
R/U............Adam
Weltz '96 3000GT
VR4
12.387 114.05
Instead they put
this..
Winner.......Randall Marabby '96
Mitsubishi 11.917 117.62
R/U............Adam
Weltz '92
Eagle 12.387
114.05
LOL, I have no idea how they messed everything up so bad..
Would have been
neat for everyone who reads Turbo Magazine too see two
Stealth/VR4's ruled the
AWD Quick 8 class..
At least they included an
AWESOME pic of Adam launching the heck out of his
'96 3000GT VR4.. Great pic
Adam!
TTYLater,
Mike Mahaffey (Randall Michael Mahaffey - for those
who wonder where the
Randall came from:)
'94 Stealth tt
Best et: 11.6
Best mph: 121.58
For subscribe/unsubscribe info, our web page is http://www.bobforrest.com/Team3S.htm
------------------------------
End
of Team3S Digest V1 #47
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